When a widget is hidden/shown with the cursor over it then a mouse move event is sent on Windows

#include <QtGui>

class MyWidget : public QWidget
{
public:
    MyWidget(const QColor &col, QWidget *parent = 0) : QWidget(parent) 
    { 
        setAutoFillBackground(true); 
        QPalette pal = palette(); 
        pal.setColor(QPalette::Window, col); 
        setPalette(pal); 
        setMouseTracking(true);
    }
protected:
    void enterEvent(QEvent *e)
    {
        qDebug() << "Enter Event" << this;
    }
    void leaveEvent(QEvent *e)
    {
        qDebug() << "Leave Event" << this;
    }
    void mouseMoveEvent(QMouseEvent *e)
    {
        qDebug() << "Mouse Move Event" << this;
    }
};

int main(int argc, char **argv)
{
    QApplication a(argc, argv);
    //a.setAttribute(Qt::AA_NativeWindows);
    MyWidget w(Qt::blue);
    w.setFixedSize(500, 500);
    QPushButton *pb = new QPushButton("Hide", &w);
    QPushButton *pb2 = new QPushButton("Show", &w);
    pb2->move(100, 0);
    MyWidget *child = new MyWidget(Qt::red, &w);
    child->setFixedSize(200, 200);
    child->move(50, 50);
    QObject::connect(pb, SIGNAL(clicked()), child, SLOT(hide())); 
    QObject::connect(pb2, SIGNAL(clicked()), child, SLOT(show()));
    w.show();
    return a.exec();
}